absoluteBLACK HOLLOWcage silences Shimano 12sp derailleurs, plus fast shifting!
AbsoluteBLACK’s HOLLOWcage gets a Dura-Ace 12-speed upgrade – or rather it promises to transform your latest Shimano Dura-Ace or Ultegra Di2 groupset into a quieter running drivetrain with the best shifting yet from any low-friction ceramic oversized pulley wheel system. The single-sided, aero-dimpled carbon composite cage and huge hollow lower pulley concept are the same,
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